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Valve "clattering" From 1st To 2nd.


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When I push my 400, it does the same thing, if you're referring to pinging. In CA, we can only get 91. Here they have told me it might be carbon buildup, or it might need a tuneup. If it really is valves specifically, the obvious thing is a valve job, where they take the heads off and grind the valves and replace any that are bad. It might just be bad gas. Try a can of Techron, maybe that will clean things up.

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